#pragma once 
#include <iostream>

#define Die(code)   \
    do              \
    {               \
        exit(code); \
    } while (0)
#define CONV(v) (struct sockaddr *)(v)


enum
{
    USAGE_ERR = 1,
    SOCKET_ERR,
    BIND_ERR,
    LISTEN_ERR,
};